Police were attending a shooting in Monterey Park, California with multiple casualities on Saturday night, the Los Angeles Times reported, citing a law enforcement source.
The shooting took place after 10 pm (0600 GMT) around the location of a Chinese Lunar New Year celebration held in Monterey Park, the newspaper said.
Tens of thousands of people had attended the festival earlier in the day.
Monterey Park is a city in Los Angeles county, around 7 miles (11 km) from downtown Los Angeles.
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